CURRENT DETECTING DEVICE
First Claim
1. A current detecting device comprising:
- a first core around which a first coil is wound, and to be disposed in a vicinity of a conductor which is a detection target;
a second core around which a second coil is wound, and to be disposed in a vicinity of the conductor;
an excitation unit configured to apply an excitation signal, having a magnitude and a direction that change at a given frequency, to the first coil and the second coil; and
a feedback unit configured to feedback a feedback signal to the excitation signal such that a magnetic flux generated in the first core due to current flowing in the conductor is cancelled out,the second coil being configured to generate a magnetic flux having a direction opposite to a magnetic flux generated by the excitation signal flowing in the first coil.
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Accused Products
Abstract
A first coil is wound around a first core, and have one end that is connected to ground and the other end that is connected to one end of a second coil. The second coil is wound around a second core, and has the one end that is connected to the first coil, and the other end that is connected to an excitation unit via a current-limiting resistor. A magnetic flux is generated in the first core by an excitation signal outputted from the excitation unit. Induced electromotive force is generated in the conductor due to the magnetic flux generated in the first core. The direction of the magnetic flux generated in the second core is opposite to the direction of the magnetic flux generated in the first core, and the induced electromotive forces of them generated in the conductor are cancelled each other out.
19 Citations
19 Claims
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1. A current detecting device comprising:
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a first core around which a first coil is wound, and to be disposed in a vicinity of a conductor which is a detection target; a second core around which a second coil is wound, and to be disposed in a vicinity of the conductor; an excitation unit configured to apply an excitation signal, having a magnitude and a direction that change at a given frequency, to the first coil and the second coil; and a feedback unit configured to feedback a feedback signal to the excitation signal such that a magnetic flux generated in the first core due to current flowing in the conductor is cancelled out, the second coil being configured to generate a magnetic flux having a direction opposite to a magnetic flux generated by the excitation signal flowing in the first coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification